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Question
Rocks?
Rocks?  
Found these in shallow water along the shoreline in ontario, canada. Many different heavy glasslike pieces of colours black, gray, blues, greens and purple. Some pieces with two different shades of one colour. There are also lightweight sponge type rock. One piece of blue glitters of a rainbow somewhat like gas on water colour.
Thank you for your time,
Debbie

Answer
To me, from the pics, the samples appear to be varieties of silica like chert-jasper-chalcedony etc.
Nowadays a lot of artificial/synthetic materials have come in the markets for a variety of use. Therefore i must caution and confess that identification of such samples be done on spot by at least by  visual examination if not by laboratory tests.

Geology

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N.K.Agarwal

Expertise

Would be happy to answer : General Geology, Engineering Geology, Economic Geology, Geomorphology, Geoenvironment, Tectonics, Natural Resources inclusive of Rocks & Minerals, Exploration, Science Policy etc.

Experience

Geological-Geotechnical Solutions and professional advice. I have over 34 years of professional experience of working as a geologist in diverse mountainous terrain. I have professional skills for planning. programming, executing and monitoring of : (1) Engineering Geological investigations in Hydropower and Developmental projects, (2) Landslide and Disaster Management etc. (3) Natural Resource Management and Programming (4) Geological Mapping (5) Geoenvironmental Management (6) Mineral Exploration (7) Water Resources Management, (8) Integrated Watershed Management, (9) Training on - Natural Resource Management, Geoenvironmental Management, Waste Management, Geohazards, Geotechnical Investigations, Data acquisition & interpretations, (10) R&D Initiatives and Societal issues etc.

Organizations
ex-Geological Survey of India. Retired Director now Geo-Consultant and Advisor -HIGEOS India

Publications
Departmental Publications mostly

Education/Credentials
M.Tech.(Applied Geology), University of Roorkee (now IIT Roorkee).

Past/Present Clients
Worked in the Geological Survey of India for aabout 32 years. Presently - GeoConsultant & Advisor - HIGEOS India

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